<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .box1 {
            width: 990px;
            height: 32px;

            background-color: red;

            margin: 0 auto;
        }
    </style>
</head>
<body>
<div class="box1"></div>
</body>
</html>